Good rubber made. Designed for violin 4/4. Easy to install. Practice without disturbing people. Material: Rubber Product Size: 5.3 * 2.6 * 1.4 cm / 2 * 1 * 0.5in Note: Violin bridge shown in the photo is not 'included. Package List: 1 * Mute Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.